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首页> 外文期刊>Mycologia >Relationships and taxonomic status of Alternaria radicina, A-carotiincultae, and A-petroselini based upon morphological, biochemical, and molecular characteristics
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Relationships and taxonomic status of Alternaria radicina, A-carotiincultae, and A-petroselini based upon morphological, biochemical, and molecular characteristics

机译：基于形态，生化和分子特征的链格孢菌，A-胡萝卜素菌和A-petroselini的关系和分类学地位

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摘要

Alternaria radicina, A. carotiinculiae, and A. petroselini are closely related pathogens of umbelliferous crops. Relationships among these fungi were determined based on growth rate, spore morphology, cultural characteristics, toxin production, and host range. Random amplified polymorphic DNA (RAPD) analysis of these species, other species of Alternaria, and closely related fungi was also performed. A. petroselini was readily differentiated from A. radicina and A. carotiincultae on the basis of spore morphology, production of microsclerotia, host range, and RAPD analysis. Alternaria radicina and A. carotiincultae were considerably more similar to each other than to A. petroselini, but could be differentiated on the basis of growth rate, spore morphology, colony morphology, and, to a limited extent, RAPD analysis. When grown on media having a high nutritional content, A. radicina produced a diffusible yellow pigment and crystals of the fungal metabolite radicinin. In contrast, A. carotiincultae produced little or no radicinin. However, when A. carotiincultae was grown on the same medium amended with radicinin, growth rate and colony and conidial morphology were more similar to those of A. radicina. These results suggest that the morphological differences between A. radicina and A. carotiincultae are due, at least in part, to radicinin production, and that these fungi are conspecific. Therefore, we propose that A. carotiincultae be considered a synonym of A. radicina.
机译：链格孢菌，链霉菌和petroselini是伞形作物的密切相关病原体。这些真菌之间的关系是根据生长速率，孢子形态，培养特性，毒素产生和寄主范围确定的。还对这些物种，链格孢属的其他物种和密切相关的真菌进行了随机扩增多态性DNA（RAPD）分析。根据孢子形态，微菌核的产生，寄主范围和RAPD分析，很容易将petroselini与radicina和a。carotiincultae区分开。链格孢菌和胭脂链霉菌彼此之间的相似性远高于petroselini，但可以根据生长速率，孢子形态，菌落形态以及在一定程度上通过RAPD分析加以区分。当在具有高营养含量的培养基上生长时，A。radicina会产生可扩散的黄色颜料和真菌代谢产物Radicinin晶体。相反，胡萝卜曲霉产生的Radicinin很少或没有。但是，当胡萝卜素培养菌在用Radicinin改良的同一培养基上生长时，其生长速率，菌落和分生孢子形态与拟南芥相似。这些结果表明，A。radicina和A. carotiincultae之间的形态学差异至少部分是由于产生了Radicinin，并且这些真菌是同种的。因此，我们建议将carotiincultae视为A. radicina的同义词。

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